// This source file is part of the polarphp.org open source project
//
// Copyright (c) 2017 - 2018 polarphp software foundation
// Copyright (c) 2017 - 2018 zzu_softboy <zzu_softboy@163.com>
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://polarphp.org/LICENSE.txt for license information
// See https://polarphp.org/CONTRIBUTORS.txt for the list of polarphp project authors
//
// Created by polarboy on 2018/12/25.

#include "polarphp/runtime/internal/DepsZendVmHeaders.h"
#include "polarphp/runtime/Snprintf.h"

#include <zend_strtod.h>
#include <mutex>

#include <stddef.h>
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#include <stdarg.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>

#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif

#ifdef HAVE_LOCALE_H
#include <locale.h>
#  ifdef ZTS
/// TODO to see use what?
//#include "ext/standard/php_string.h"
#  define LCONV_DECIMAL_POINT (*lconv.decimal_point)
#  else
#  define LCONV_DECIMAL_POINT (*lconv->decimal_point)
#  endif
#else
#  define LCONV_DECIMAL_POINT '.'
#endif

/*
 * Copyright (c) 2002, 2006 Todd C. Miller <Todd.Miller@courtesan.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 * Sponsored in part by the Defense Advanced Research Projects
 * Agency (DARPA) and Air Force Research Laboratory, Air Force
 * Materiel Command, USAF, under agreement number F39502-99-1-0512.
 */

namespace polar {
namespace runtime {

std::mutex sg_localeMutex;

static char * __cvt(double value, int ndigit, int *decpt, int *sign, int fmode, int pad) /* {{{ */
{
   char *s = NULL;
   char *p, *rve, c;
   size_t siz;

   if (ndigit < 0) {
      siz = -ndigit + 1;
   } else {
      siz = ndigit + 1;
   }

   /* __dtoa() doesn't allocate space for 0 so we do it by hand */
   if (value == 0.0) {
      *decpt = 1 - fmode; /* 1 for 'e', 0 for 'f' */
      *sign = 0;
      if ((rve = s = (char *)malloc(ndigit?siz:2)) == NULL) {
         return(NULL);
      }
      *rve++ = '0';
      *rve = '\0';
      if (!ndigit) {
         return(s);
      }
   } else {
      p = zend_dtoa(value, fmode + 2, ndigit, decpt, sign, &rve);
      if (*decpt == 9999) {
         /* Infinity or Nan, convert to inf or nan like printf */
         *decpt = 0;
         c = *p;
         zend_freedtoa(p);
         return strdup((c == 'I' ? "INF" : "NAN"));
      }
      /* Make a local copy and adjust rve to be in terms of s */
      if (pad && fmode) {
         siz += *decpt;
      }
      if ((s = (char *)malloc(siz+1)) == NULL) {
         zend_freedtoa(p);
         return(NULL);
      }
      (void) strlcpy(s, p, siz);
      rve = s + (rve - p);
      zend_freedtoa(p);
   }

   /* Add trailing zeros */
   if (pad) {
      siz -= rve - s;
      while (--siz) {
         *rve++ = '0';
      }
      *rve = '\0';
   }

   return(s);
}
/* }}} */

static inline char *php_ecvt(double value, int ndigit, int *decpt, int *sign) /* {{{ */
{
   return(__cvt(value, ndigit, decpt, sign, 0, 1));
}
/* }}} */

static inline char *php_fcvt(double value, int ndigit, int *decpt, int *sign) /* {{{ */
{
   return(__cvt(value, ndigit, decpt, sign, 1, 1));
}
/* }}} */

char *php_gcvt(double value, int ndigit, char dec_point, char exponent, char *buf) /* {{{ */
{
   char *digits, *dst, *src;
   int i, decpt, sign;
   int mode = ndigit >= 0 ? 2 : 0;

   if (mode == 0) {
      ndigit = 17;
   }
   digits = zend_dtoa(value, mode, ndigit, &decpt, &sign, NULL);
   if (decpt == 9999) {
      /*
       * Infinity or NaN, convert to inf or nan with sign.
       * We assume the buffer is at least ndigit long.
       */
      snprintf(buf, ndigit + 1, "%s%s", (sign && *digits == 'I') ? "-" : "", *digits == 'I' ? "INF" : "NAN");
      zend_freedtoa(digits);
      return (buf);
   }

   dst = buf;
   if (sign) {
      *dst++ = '-';
   }

   if ((decpt >= 0 && decpt > ndigit) || decpt < -3) { /* use E-style */
      /* exponential format (e.g. 1.2345e+13) */
      if (--decpt < 0) {
         sign = 1;
         decpt = -decpt;
      } else {
         sign = 0;
      }
      src = digits;
      *dst++ = *src++;
      *dst++ = dec_point;
      if (*src == '\0') {
         *dst++ = '0';
      } else {
         do {
            *dst++ = *src++;
         } while (*src != '\0');
      }
      *dst++ = exponent;
      if (sign) {
         *dst++ = '-';
      } else {
         *dst++ = '+';
      }
      if (decpt < 10) {
         *dst++ = '0' + decpt;
         *dst = '\0';
      } else {
         /* XXX - optimize */
         for (sign = decpt, i = 0; (sign /= 10) != 0; i++)
            continue;
         dst[i + 1] = '\0';
         while (decpt != 0) {
            dst[i--] = '0' + decpt % 10;
            decpt /= 10;
         }
      }
   } else if (decpt < 0) {
      /* standard format 0. */
      *dst++ = '0';   /* zero before decimal point */
      *dst++ = dec_point;
      do {
         *dst++ = '0';
      } while (++decpt < 0);
      src = digits;
      while (*src != '\0') {
         *dst++ = *src++;
      }
      *dst = '\0';
   } else {
      /* standard format */
      for (i = 0, src = digits; i < decpt; i++) {
         if (*src != '\0') {
            *dst++ = *src++;
         } else {
            *dst++ = '0';
         }
      }
      if (*src != '\0') {
         if (src == digits) {
            *dst++ = '0';   /* zero before decimal point */
         }
         *dst++ = dec_point;
         for (i = decpt; digits[i] != '\0'; i++) {
            *dst++ = digits[i];
         }
      }
      *dst = '\0';
   }
   zend_freedtoa(digits);
   return (buf);
}
/* }}} */

/* {{{ Apache license */
/* ====================================================================
 * Copyright (c) 1995-1998 The Apache Group.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * 4. The names "Apache Server" and "Apache Group" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission.
 *
 * 5. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the Apache Group
 *    for use in the Apache HTTP server project (http://www.apache.org/)."
 *
 * THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE APACHE GROUP OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Group and was originally based
 * on public domain software written at the National Center for
 * Supercomputing Applications, University of Illinois, Urbana-Champaign.
 * For more information on the Apache Group and the Apache HTTP server
 * project, please see <http://www.apache.org/>.
 *
 * This code is based on, and used with the permission of, the
 * SIO stdio-replacement strx_* functions by Panos Tsirigotis
 * <panos@alumni.cs.colorado.edu> for xinetd.
 */
/* }}} */

#define FALSE			0
#define TRUE			1
#define NUL			'\0'
#define INT_NULL		((int *)0)

#define S_NULL			"(null)"
#define S_NULL_LEN		6

#define FLOAT_DIGITS		6
#define EXPONENT_LENGTH		10


/*
 * Convert num to its decimal format.
 * Return value:
 *   - a pointer to a string containing the number (no sign)
 *   - len contains the length of the string
 *   - is_negative is set to TRUE or FALSE depending on the sign
 *     of the number (always set to FALSE if is_unsigned is TRUE)
 *
 * The caller provides a buffer for the string: that is the buf_end argument
 * which is a pointer to the END of the buffer + 1 (i.e. if the buffer
 * is declared as buf[ 100 ], buf_end should be &buf[ 100 ])
 */
/* char * ap_php_conv_10() {{{ */
char * ap_php_conv_10(wide_int num, bool_int is_unsigned,
                      bool_int * is_negative, char *buf_end, size_t *len)
{
   char *p = buf_end;
   u_wide_int magnitude;

   if (is_unsigned) {
      magnitude = static_cast<u_wide_int>(num);
      *is_negative = FALSE;
   } else {
      *is_negative = (num < 0);

      /*
       * On a 2's complement machine, negating the most negative integer
       * results in a number that cannot be represented as a signed integer.
       * Here is what we do to obtain the number's magnitude:
       *      a. add 1 to the number
       *      b. negate it (becomes positive)
       *      c. convert it to unsigned
       *      d. add 1
       */
      if (*is_negative) {
         wide_int t = num + 1;
         magnitude = (static_cast<u_wide_int>(- t)) + 1;
      } else {
         magnitude = static_cast<u_wide_int>(num);
      }
   }

   /*
    * We use a do-while loop so that we write at least 1 digit
    */
   do {
      u_wide_int new_magnitude = magnitude / 10;

      *--p = (char)(magnitude - new_magnitude * 10 + '0');
      magnitude = new_magnitude;
   }
   while (magnitude);

   *len = buf_end - p;
   return (p);
}
/* }}} */

/* If you change this value then also change bug24640.phpt.
 * Also NDIG must be reasonable smaller than NUM_BUF_SIZE.
 */
#define	NDIG	320


/*
 * Convert a floating point number to a string formats 'f', 'e' or 'E'.
 * The result is placed in buf, and len denotes the length of the string
 * The sign is returned in the is_negative argument (and is not placed
 * in buf).
 */
char * php_conv_fp(char format, double num,
                   boolean_e add_dp, int precision, char dec_point, bool_int * is_negative, char *buf, size_t *len)
{
   char *s = buf;
   char *p, *p_orig;
   int decimal_point;

   if (precision >= NDIG - 1) {
      precision = NDIG - 2;
   }

   if (format == 'F') {
      p_orig = p = php_fcvt(num, precision, &decimal_point, is_negative);
   } else {						/* either e or E format */
      p_orig = p = php_ecvt(num, precision + 1, &decimal_point, is_negative);
   }

   /*
    * Check for Infinity and NaN
    */
   if (isalpha((int)*p)) {
      *len = strlen(p);
      memcpy(buf, p, *len + 1);
      *is_negative = FALSE;
      free(p_orig);
      return (buf);
   }
   if (format == 'F') {
      if (decimal_point <= 0) {
         if (num != 0 || precision > 0) {
            *s++ = '0';
            if (precision > 0) {
               *s++ = dec_point;
               while (decimal_point++ < 0) {
                  *s++ = '0';
               }
            } else if (add_dp) {
               *s++ = dec_point;
            }
         }
      } else {
         int addz = decimal_point >= NDIG ? decimal_point - NDIG + 1 : 0;
         decimal_point -= addz;
         while (decimal_point-- > 0) {
            *s++ = *p++;
         }
         while (addz-- > 0) {
            *s++ = '0';
         }
         if (precision > 0 || add_dp) {
            *s++ = dec_point;
         }
      }
   } else {
      *s++ = *p++;
      if (precision > 0 || add_dp) {
         *s++ = '.';
      }
   }

   /*
    * copy the rest of p, the NUL is NOT copied
    */
   while (*p) {
      *s++ = *p++;
   }

   if (format != 'F') {
      char temp[EXPONENT_LENGTH];		/* for exponent conversion */
      size_t t_len;
      bool_int exponent_is_negative;

      *s++ = format;			/* either e or E */
      decimal_point--;
      if (decimal_point != 0) {
         p = ap_php_conv_10((wide_int) decimal_point, FALSE, &exponent_is_negative, &temp[EXPONENT_LENGTH], &t_len);
         *s++ = exponent_is_negative ? '-' : '+';

         /*
          * Make sure the exponent has at least 2 digits
          */
         while (t_len--) {
            *s++ = *p++;
         }
      } else {
         *s++ = '+';
         *s++ = '0';
      }
   }
   *len = s - buf;
   free(p_orig);
   return (buf);
}

/*
 * Convert num to a base X number where X is a power of 2. nbits determines X.
 * For example, if nbits is 3, we do base 8 conversion
 * Return value:
 *      a pointer to a string containing the number
 *
 * The caller provides a buffer for the string: that is the buf_end argument
 * which is a pointer to the END of the buffer + 1 (i.e. if the buffer
 * is declared as buf[ 100 ], buf_end should be &buf[ 100 ])
 */
char * ap_php_conv_p2(u_wide_int num, int nbits, char format, char *buf_end, size_t *len) /* {{{ */
{
   int mask = (1 << nbits) - 1;
   char *p = buf_end;
   static const char low_digits[] = "0123456789abcdef";
   static const char upper_digits[] = "0123456789ABCDEF";
   const char *digits = (format == 'X') ? upper_digits : low_digits;

   do {
      *--p = digits[num & mask];
      num >>= nbits;
   }
   while (num);

   *len = buf_end - p;
   return (p);
}

/*
 * NUM_BUF_SIZE is the size of the buffer used for arithmetic conversions
 *
 * XXX: this is a magic number; do not decrease it
 * Emax = 1023
 * NDIG = 320
 * NUM_BUF_SIZE >= strlen("-") + Emax + strlrn(".") + NDIG + strlen("E+1023") + 1;
 */
#define NUM_BUF_SIZE		2048


/*
 * Descriptor for buffer area
 */
struct buf_area {
   char *buf_end;
   char *nextb;				/* pointer to next byte to read/write   */
};

typedef struct buf_area buffy;

/*
 * The INS_CHAR macro inserts a character in the buffer and writes
 * the buffer back to disk if necessary
 * It uses the char pointers sp and bep:
 *      sp points to the next available character in the buffer
 *      bep points to the end-of-buffer+1
 * While using this macro, note that the nextb pointer is NOT updated.
 *
 * NOTE: Evaluation of the c argument should not have any side-effects
 */
#define INS_CHAR(c, sp, bep, cc) \
{                            \
   if (sp < bep)            \
{                        \
   *sp++ = c;           \
}                        \
   cc++;                    \
}

#define NUM( c )			( c - '0' )

#define STR_TO_DEC( str, num )		\
   num = NUM( *str++ ) ;		\
   while ( isdigit((int)*str ) )		\
{					\
   num *= 10 ;			\
   num += NUM( *str++ ) ;		\
}

/*
 * This macro does zero padding so that the precision
 * requirement is satisfied. The padding is done by
 * adding '0's to the left of the string that is going
 * to be printed.
 */
#define FIX_PRECISION( adjust, precision, s, s_len )	\
   if ( adjust )						\
   while ( s_len < (size_t)precision )	\
{									\
   *--s = '0' ;					\
   s_len++ ;						\
}

/*
 * Macro that does padding. The padding is done by printing
 * the character ch.
 */
#define PAD( width, len, ch )	do		\
{					\
   INS_CHAR( ch, sp, bep, cc ) ;	\
   width-- ;				\
}					\
   while ( width > len )

/*
 * Prefix the character ch to the string str
 * Increase length
 * Set the has_prefix flag
 */
#define PREFIX( str, length, ch )	 *--str = ch ; length++ ; has_prefix = YES

/*
 * Do format conversion placing the output in buffer
 */
static int format_converter(buffy * odp, const char *fmt, va_list ap) /* {{{ */
{
   char *sp;
   char *bep;
   int cc = 0;
   size_t i;

   char *s = NULL;
   size_t s_len;
   int free_zcopy;
   zval *zvp, zcopy;

   int min_width = 0;
   int precision = 0;
   enum {
      LEFT, RIGHT
   } adjust;
   char pad_char;
   char prefix_char;

   double fp_num;
   wide_int i_num = (wide_int) 0;
   u_wide_int ui_num;

   char num_buf[NUM_BUF_SIZE];
   char char_buf[2];			/* for printing %% and %<unknown> */

#ifdef HAVE_LOCALE_H
#ifdef ZTS
   struct lconv lconv;
#else
   struct lconv *lconv = NULL;
#endif
#endif

   /*
    * Flag variables
    */
   length_modifier_e modifier;
   boolean_e alternate_form;
   boolean_e print_sign;
   boolean_e print_blank;
   boolean_e adjust_precision;
   boolean_e adjust_width;
   bool_int is_negative;

   sp = odp->nextb;
   bep = odp->buf_end;

   while (*fmt) {
      if (*fmt != '%') {
         INS_CHAR(*fmt, sp, bep, cc);
      } else {
         /*
          * Default variable settings
          */
         adjust = RIGHT;
         alternate_form = print_sign = print_blank = NO;
         pad_char = ' ';
         prefix_char = NUL;
         free_zcopy = 0;

         fmt++;

         /*
          * Try to avoid checking for flags, width or precision
          */
         if (isascii((int)*fmt) && !islower((int)*fmt)) {
            /*
             * Recognize flags: -, #, BLANK, +
             */
            for (;; fmt++) {
               if (*fmt == '-')
                  adjust = LEFT;
               else if (*fmt == '+')
                  print_sign = YES;
               else if (*fmt == '#')
                  alternate_form = YES;
               else if (*fmt == ' ')
                  print_blank = YES;
               else if (*fmt == '0')
                  pad_char = '0';
               else
                  break;
            }

            /*
             * Check if a width was specified
             */
            if (isdigit((int)*fmt)) {
               STR_TO_DEC(fmt, min_width);
               adjust_width = YES;
            } else if (*fmt == '*') {
               min_width = va_arg(ap, int);
               fmt++;
               adjust_width = YES;
               if (min_width < 0) {
                  adjust = LEFT;
                  min_width = -min_width;
               }
            } else
               adjust_width = NO;

            /*
             * Check if a precision was specified
             */
            if (*fmt == '.') {
               adjust_precision = YES;
               fmt++;
               if (isdigit((int)*fmt)) {
                  STR_TO_DEC(fmt, precision);
               } else if (*fmt == '*') {
                  precision = va_arg(ap, int);
                  fmt++;
                  if (precision < 0)
                     precision = 0;
               } else
                  precision = 0;

               if (precision > FORMAT_CONV_MAX_PRECISION) {
                  precision = FORMAT_CONV_MAX_PRECISION;
               }
            } else
               adjust_precision = NO;
         } else
            adjust_precision = adjust_width = NO;

         /*
          * Modifier check
          */
         switch (*fmt) {
         case 'L':
            fmt++;
            modifier = LM_LONG_DOUBLE;
            break;
         case 'I':
            fmt++;
#if SIZEOF_LONG_LONG
            if (*fmt == '6' && *(fmt+1) == '4') {
               fmt += 2;
               modifier = LM_LONG_LONG;
            } else
#endif
               if (*fmt == '3' && *(fmt+1) == '2') {
                  fmt += 2;
                  modifier = LM_LONG;
               } else {
#ifdef _WIN64
                  modifier = LM_LONG_LONG;
#else
                  modifier = LM_LONG;
#endif
               }
            break;
         case 'l':
            fmt++;
#if SIZEOF_LONG_LONG
            if (*fmt == 'l') {
               fmt++;
               modifier = LM_LONG_LONG;
            } else
#endif
               modifier = LM_LONG;
            break;
         case 'z':
            fmt++;
            modifier = LM_SIZE_T;
            break;
         case 'j':
            fmt++;
#if SIZEOF_INTMAX_T
            modifier = LM_INTMAX_T;
#else
            modifier = LM_SIZE_T;
#endif
            break;
         case 't':
            fmt++;
#if SIZEOF_PTRDIFF_T
            modifier = LM_PTRDIFF_T;
#else
            modifier = LM_SIZE_T;
#endif
            break;
         case 'p':
            fmt++;
            modifier = LM_PHP_INT_T;
            break;
         case 'h':
            fmt++;
            if (*fmt == 'h') {
               fmt++;
            }
            POLAR_FALLTHROUGH;
            /* these are promoted to int, so no break */
         default:
            modifier = LM_STD;
            break;
         }

         /*
          * Argument extraction and printing.
          * First we determine the argument type.
          * Then, we convert the argument to a string.
          * On exit from the switch, s points to the string that
          * must be printed, s_len has the length of the string
          * The precision requirements, if any, are reflected in s_len.
          *
          * NOTE: pad_char may be set to '0' because of the 0 flag.
          *   It is reset to ' ' by non-numeric formats
          */
         switch (*fmt) {
         case 'Z': {
            zvp = (zval*) va_arg(ap, zval*);
            free_zcopy = zend_make_printable_zval(zvp, &zcopy);
            if (free_zcopy) {
               zvp = &zcopy;
            }
            s_len = Z_STRLEN_P(zvp);
            s = Z_STRVAL_P(zvp);
            if (adjust_precision && (size_t)precision < s_len) {
               s_len = precision;
            }
            break;
         }
         case 'u':
            switch(modifier) {
            default:
               i_num = static_cast<wide_int>(va_arg(ap, unsigned int));
               break;
            case LM_LONG_DOUBLE:
               goto fmt_error;
            case LM_LONG:
               i_num = static_cast<wide_int>(va_arg(ap, unsigned long int));
               break;
            case LM_SIZE_T:
               i_num = static_cast<wide_int>(va_arg(ap, size_t));
               break;
#if SIZEOF_LONG_LONG
            case LM_LONG_LONG:
               i_num = static_cast<wide_int>(va_arg(ap, u_wide_int));
               break;
#endif
#if SIZEOF_INTMAX_T
            case LM_INTMAX_T:
               i_num = static_cast<wide_int>(va_arg(ap, uintmax_t));
               break;
#endif
#if SIZEOF_PTRDIFF_T
            case LM_PTRDIFF_T:
               i_num = static_cast<wide_int>(va_arg(ap, ptrdiff_t));
               break;
#endif
            case LM_PHP_INT_T:
               i_num = static_cast<wide_int>(va_arg(ap, zend_ulong));
               break;
            }
            POLAR_FALLTHROUGH;
            /*
                * The rest also applies to other integer formats, so fall
                * into that case.
                */
         case 'd':
         case 'i':
            /*
                * Get the arg if we haven't already.
                */
            if ((*fmt) != 'u') {
               switch(modifier) {
               default:
                  i_num = static_cast<wide_int>(va_arg(ap, int));
                  break;
               case LM_LONG_DOUBLE:
                  goto fmt_error;
               case LM_LONG:
                  i_num = static_cast<wide_int>(va_arg(ap, long int));
                  break;
               case LM_SIZE_T:
#if SIZEOF_SSIZE_T
                  i_num = static_cast<wide_int>(va_arg(ap, ssize_t));
#else
                  i_num = static_cast<wide_int>(va_arg(ap, size_t));
#endif
                  break;
#if SIZEOF_LONG_LONG
               case LM_LONG_LONG:
                  i_num = static_cast<wide_int>(va_arg(ap, wide_int));
                  break;
#endif
#if SIZEOF_INTMAX_T
               case LM_INTMAX_T:
                  i_num = static_cast<wide_int>(va_arg(ap, intmax_t));
                  break;
#endif
#if SIZEOF_PTRDIFF_T
               case LM_PTRDIFF_T:
                  i_num = static_cast<wide_int>(va_arg(ap, ptrdiff_t));
                  break;
#endif
               case LM_PHP_INT_T:
                  i_num = static_cast<wide_int>(va_arg(ap, zend_long));
                  break;
               }
            }
            s = ap_php_conv_10(i_num, (*fmt) == 'u', &is_negative,
                               &num_buf[NUM_BUF_SIZE], &s_len);
            FIX_PRECISION(adjust_precision, precision, s, s_len);

            if (*fmt != 'u') {
               if (is_negative) {
                  prefix_char = '-';
               } else if (print_sign) {
                  prefix_char = '+';
               } else if (print_blank) {
                  prefix_char = ' ';
               }
            }
            break;


         case 'o':
            switch(modifier) {
            default:
               ui_num = static_cast<u_wide_int>(va_arg(ap, unsigned int));
               break;
            case LM_LONG_DOUBLE:
               goto fmt_error;
            case LM_LONG:
               ui_num = static_cast<u_wide_int>(va_arg(ap, unsigned long int));
               break;
            case LM_SIZE_T:
               ui_num = static_cast<u_wide_int>(va_arg(ap, size_t));
               break;
#if SIZEOF_LONG_LONG
            case LM_LONG_LONG:
               ui_num = static_cast<u_wide_int>(va_arg(ap, u_wide_int));
               break;
#endif
#if SIZEOF_INTMAX_T
            case LM_INTMAX_T:
               ui_num = static_cast<u_wide_int>(va_arg(ap, uintmax_t));
               break;
#endif
#if SIZEOF_PTRDIFF_T
            case LM_PTRDIFF_T:
               ui_num = static_cast<u_wide_int>(va_arg(ap, ptrdiff_t));
               break;
#endif
            case LM_PHP_INT_T:
               ui_num = static_cast<u_wide_int>(va_arg(ap, zend_ulong));
               break;
            }
            s = ap_php_conv_p2(ui_num, 3, *fmt, &num_buf[NUM_BUF_SIZE], &s_len);
            FIX_PRECISION(adjust_precision, precision, s, s_len);
            if (alternate_form && *s != '0') {
               *--s = '0';
               s_len++;
            }
            break;


         case 'x':
         case 'X':
            switch(modifier) {
            default:
               ui_num = static_cast<u_wide_int>(va_arg(ap, unsigned int));
               break;
            case LM_LONG_DOUBLE:
               goto fmt_error;
            case LM_LONG:
               ui_num = static_cast<u_wide_int>(va_arg(ap, unsigned long int));
               break;
            case LM_SIZE_T:
               ui_num = static_cast<u_wide_int>(va_arg(ap, size_t));
               break;
#if SIZEOF_LONG_LONG
            case LM_LONG_LONG:
               ui_num = static_cast<u_wide_int>(va_arg(ap, u_wide_int));
               break;
#endif
#if SIZEOF_INTMAX_T
            case LM_INTMAX_T:
               ui_num = static_cast<u_wide_int>(va_arg(ap, uintmax_t));
               break;
#endif
#if SIZEOF_PTRDIFF_T
            case LM_PTRDIFF_T:
               ui_num = static_cast<u_wide_int>(va_arg(ap, ptrdiff_t));
               break;
#endif
            case LM_PHP_INT_T:
               ui_num = static_cast<u_wide_int>(va_arg(ap, zend_ulong));
               break;
            }
            s = ap_php_conv_p2(ui_num, 4, *fmt, &num_buf[NUM_BUF_SIZE], &s_len);
            FIX_PRECISION(adjust_precision, precision, s, s_len);
            if (alternate_form && i_num != 0) {
               *--s = *fmt;	/* 'x' or 'X' */
               *--s = '0';
               s_len += 2;
            }
            break;


         case 's':
         case 'v':
            s = va_arg(ap, char *);
            if (s != NULL) {
               s_len = strlen(s);
               if (adjust_precision && (size_t)precision < s_len) {
                  s_len = precision;
               }
            } else {
               s = const_cast<char *>(S_NULL);
               s_len = S_NULL_LEN;
            }
            pad_char = ' ';
            break;


         case 'f':
         case 'F':
         case 'e':
         case 'E':
            switch(modifier) {
            case LM_LONG_DOUBLE:
               fp_num = (double) va_arg(ap, long double);
               break;
            case LM_STD:
               fp_num = va_arg(ap, double);
               break;
            default:
               goto fmt_error;
            }

            if (zend_isnan(fp_num)) {
               s = const_cast<char *>("NAN");
               s_len = 3;
            } else if (zend_isinf(fp_num)) {
               s = const_cast<char *>("INF");
               s_len = 3;
            } else {
#ifdef HAVE_LOCALE_H
#ifdef ZTS
               localeconv_r(&lconv);
#else
               if (!lconv) {
                  lconv = localeconv();
               }
#endif
#endif
               s = php_conv_fp((*fmt == 'f')?'F':*fmt, fp_num, alternate_form,
                               (adjust_precision == NO) ? FLOAT_DIGITS : precision,
                               (*fmt == 'f')?LCONV_DECIMAL_POINT:'.',
                               &is_negative, &num_buf[1], &s_len);
               if (is_negative)
                  prefix_char = '-';
               else if (print_sign)
                  prefix_char = '+';
               else if (print_blank)
                  prefix_char = ' ';
            }
            break;


         case 'g':
         case 'k':
         case 'G':
         case 'H':
            switch(modifier) {
            case LM_LONG_DOUBLE:
               fp_num = (double) va_arg(ap, long double);
               break;
            case LM_STD:
               fp_num = va_arg(ap, double);
               break;
            default:
               goto fmt_error;
            }

            if (zend_isnan(fp_num)) {
               s = const_cast<char *>("NAN");
               s_len = 3;
               break;
            } else if (zend_isinf(fp_num)) {
               if (fp_num > 0) {
                  s = const_cast<char *>("INF");
                  s_len = 3;
               } else {
                  s = const_cast<char *>("-INF");
                  s_len = 4;
               }
               break;
            }

            if (adjust_precision == NO) {
               precision = FLOAT_DIGITS;
            } else if (precision == 0) {
               precision = 1;
            }
            /*
                * * We use &num_buf[ 1 ], so that we have room for the sign
                */
#ifdef HAVE_LOCALE_H
#ifdef ZTS
            localeconv_r(&lconv);
#else
            if (!lconv) {
               lconv = localeconv();
            }
#endif
#endif
            s = php_gcvt(fp_num, precision, (*fmt=='H' || *fmt == 'k') ? '.' : LCONV_DECIMAL_POINT, (*fmt == 'G' || *fmt == 'H')?'E':'e', &num_buf[1]);
            if (*s == '-') {
               prefix_char = *s++;
            } else if (print_sign) {
               prefix_char = '+';
            } else if (print_blank) {
               prefix_char = ' ';
            }

            s_len = strlen(s);

            if (alternate_form && (strchr(s, '.')) == NULL) {
               s[s_len++] = '.';
            }
            break;


         case 'c':
            char_buf[0] = (char) (va_arg(ap, int));
            s = &char_buf[0];
            s_len = 1;
            pad_char = ' ';
            break;


         case '%':
            char_buf[0] = '%';
            s = &char_buf[0];
            s_len = 1;
            pad_char = ' ';
            break;


         case 'n':
            *(va_arg(ap, int *)) = cc;
            goto skip_output;

            /*
                * Always extract the argument as a "char *" pointer. We
                * should be using "void *" but there are still machines
                * that don't understand it.
                * If the pointer size is equal to the size of an unsigned
                * integer we convert the pointer to a hex number, otherwise
                * we print "%p" to indicate that we don't handle "%p".
                */
         case 'p':
            if (sizeof(char *) <= sizeof(u_wide_int)) {
               ui_num = (u_wide_int)((size_t) va_arg(ap, char *));
               s = ap_php_conv_p2(ui_num, 4, 'x',
                                  &num_buf[NUM_BUF_SIZE], &s_len);
               if (ui_num != 0) {
                  *--s = 'x';
                  *--s = '0';
                  s_len += 2;
               }
            } else {
               s = const_cast<char *>("%p");
               s_len = 2;
            }
            pad_char = ' ';
            break;


         case NUL:
            /*
                * The last character of the format string was %.
                * We ignore it.
                */
            continue;


fmt_error:
            php_error(E_ERROR, "Illegal length modifier specified '%c' in s[np]printf call", *fmt);
            POLAR_FALLTHROUGH;
            /*
                * The default case is for unrecognized %'s.
                * We print %<char> to help the user identify what
                * option is not understood.
                * This is also useful in case the user wants to pass
                * the output of format_converter to another function
                * that understands some other %<char> (like syslog).
                * Note that we can't point s inside fmt because the
                * unknown <char> could be preceded by width etc.
                */
         default:
            char_buf[0] = '%';
            char_buf[1] = *fmt;
            s = char_buf;
            s_len = 2;
            pad_char = ' ';
            break;
         }

         if (prefix_char != NUL) {
            *--s = prefix_char;
            s_len++;
         }
         if (adjust_width && adjust == RIGHT && (size_t)min_width > s_len) {
            if (pad_char == '0' && prefix_char != NUL) {
               INS_CHAR(*s, sp, bep, cc)
                     s++;
               s_len--;
               min_width--;
            }
            PAD((size_t)min_width, s_len, pad_char);
         }
         /*
          * Print the string s.
          */
         for (i = s_len; i != 0; i--) {
            INS_CHAR(*s, sp, bep, cc);
            s++;
         }

         if (adjust_width && adjust == LEFT && (size_t)min_width > s_len)
            PAD((size_t)min_width, s_len, pad_char);
         if (free_zcopy) {
            zval_ptr_dtor_str(&zcopy);
         }
      }
skip_output:
      fmt++;
   }
   odp->nextb = sp;
   return (cc);
}
/* }}} */

/*
 * This is the general purpose conversion function.
 */
static void strx_printv(int *ccp, char *buf, size_t len, const char *format, va_list ap) /* {{{ */
{
   buffy od;
   int cc;

   /*
    * First initialize the descriptor
    * Notice that if no length is given, we initialize buf_end to the
    * highest possible address.
    */
   if (len == 0) {
      od.buf_end = (char *) ~0;
      od.nextb   = (char *) ~0;
   } else {
      od.buf_end = &buf[len-1];
      od.nextb   = buf;
   }

   /*
    * Do the conversion
    */
   cc = format_converter(&od, format, ap);
   if (len != 0 && od.nextb <= od.buf_end) {
      *(od.nextb) = '\0';
   }
   if (ccp) {
      *ccp = cc;
   }
}
/* }}} */

int ap_php_slprintf(char *buf, size_t len, const char *format,...) /* {{{ */
{
   int cc;
   va_list ap;

   va_start(ap, format);
   strx_printv(&cc, buf, len, format, ap);
   va_end(ap);
   if ((size_t)cc >= len) {
      cc = (int)len -1;
      buf[cc] = '\0';
   }
   return cc;
}
/* }}} */

int ap_php_vslprintf(char *buf, size_t len, const char *format, va_list ap) /* {{{ */
{
   int cc;

   strx_printv(&cc, buf, len, format, ap);
   if ((size_t)cc >= len) {
      cc = (int)len -1;
      buf[cc] = '\0';
   }
   return cc;
}
/* }}} */

int ap_php_snprintf(char *buf, size_t len, const char *format,...) /* {{{ */
{
   int cc;
   va_list ap;

   va_start(ap, format);
   strx_printv(&cc, buf, len, format, ap);
   va_end(ap);
   return (cc);
}
/* }}} */

int ap_php_vsnprintf(char *buf, size_t len, const char *format, va_list ap) /* {{{ */
{
   int cc;

   strx_printv(&cc, buf, len, format, ap);
   return (cc);
}
/* }}} */

int ap_php_vasprintf(char **buf, const char *format, va_list ap) /* {{{ */
{
   va_list ap2;
   int cc;

   va_copy(ap2, ap);
   cc = ap_php_vsnprintf(NULL, 0, format, ap2);
   va_end(ap2);

   *buf = NULL;

   if (cc >= 0) {
      if ((*buf = reinterpret_cast<char *>(malloc(++cc))) != NULL) {
         if ((cc = ap_php_vsnprintf(*buf, cc, format, ap)) < 0) {
            free(*buf);
            *buf = NULL;
         }
      }
   }

   return cc;
}
/* }}} */

int ap_php_asprintf(char **buf, const char *format, ...) /* {{{ */
{
   int cc;
   va_list ap;

   va_start(ap, format);
   cc = vasprintf(buf, format, ap);
   va_end(ap);
   return cc;
}

#ifdef HAVE_LOCALECONV
/// localeconv_r
/// glibc's localeconv is not reentrant, so lets make it so ... sorta
///
::lconv *localeconv_r(::lconv *out)
{
   std::lock_guard locker(sg_localeMutex);
   /*  cur->locinfo is struct __crt_locale_info which implementation is
   hidden in vc14. TODO revisit this and check if a workaround available
   and needed. */
#if defined(POLAR_OS_WIN32) && _MSC_VER < 1900 && defined(ZTS)
   {
      /* Even with the enabled per thread locale, localeconv
         won't check any locale change in the master thread. */
      _locale_t cur = _get_current_locale();
      *out = *cur->locinfo->lconv;
      _free_locale(cur);
   }
#else
   /* localeconv doesn't return an error condition */
   *out = *localeconv();
#endif
   return out;
}

#endif

} // runtime
} // polar
